Magneto-optical recording medium target and manufacture method o

Details Magneto-optical recording medium target and manufacture method o Magneto-optical recording medium target and manufacture method o

1996-03-08

1998-01-20

Mai, Ngoclan

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

419 30, 419 39, 419 48, C22C 1900, B22F 300

Patent

active

057103844

ABSTRACT:
The invention provides a magneto-optical recording medium target and a manufacture method thereof which target can produce the leakage magnetic flux in sufficient density and has the high mechanical strength. The target is a sintered body containing 15 to 30 atomic % at least one rare earth metal and the balance at least one transition metal, in which alloy powder having such a composition is sintered so that the original morphology of the alloy powder essentially remains. Specifically, the target has a micro structure in which the alloy powder particles consisted of the rare earth metal and the transition metal are interconnected through grain boundary phases. The target is able to have the deflective strength not less than 50 MPa, the relative density not less than 99%, and the content of oxygen not more than 1000 ppm. Particulate micro structures preferably have a grain size d.ltoreq.250 .mu.m and a volume mean size d.sub.av of 50.ltoreq.d.sub.ad .ltoreq.120 .mu.m. The target can be manufactured by producing alloy powder having the above target composition and sintering the alloy powder at a temperature lower than the liquid phase occurring temperature by 30.degree. C. or more and under a high pressure not less than 90 MPa.

REFERENCES:
patent: 4620872 (1986-11-01), Hijikata et al.
patent: 4824481 (1989-04-01), Chatterjee et al.
patent: 4957549 (1990-09-01), Matsumoto et al.
patent: 5062885 (1991-11-01), Matsumoto et al.
patent: 5098649 (1992-03-01), Matsumoto et al.

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